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We discuss a version of the fundamental theorem of calculus in several variables and some applications, of potential interest as a teaching material in undergraduate courses.

History and Overview · Mathematics 2023-08-16 Joaquim Bruna

We solve two continuous extremal problems on the classes of monotone functions: in the first problem we find extremal values for a line integral of a coordinate-wise monotone function of two variables from a rearrange\-ment-invariant class…

Functional Analysis · Mathematics 2026-03-03 Oleg Kovalenko

This paper introduces a variation on an identity by Bruckman and Good. Using this identity, we are able to derive various well-known sums involving reciprocals of Fibonacci and Lucas numbers, including the case when the indices form an…

Number Theory · Mathematics 2025-08-26 Hongshen Chua

We establish an equivalent condition to the validity of the Collatz conjecture, using elementary methods. We derive some conclusions and show several examples of our results. We also offer a variety of exercises, problems and conjectures.

Dynamical Systems · Mathematics 2007-05-23 Diego Dominici

We prove recursive formulas involving sums of divisors and sums of triangular numbers and give a variety of identities relating arithmetic functions to divisor functions providing inductive identities for such arithmetic functions.

Number Theory · Mathematics 2011-05-02 Mohamed El Bachraoui

We prove a q-series identity that generalises Macdonald's A_{2n}^{(2)} eta-function identity and the Rogers-Ramanujan identities. We conjecture our result to generalise even further to also include the Andrews-Gordon identities.

Combinatorics · Mathematics 2012-02-28 S. Ole Warnaar , Wadim Zudilin

In our present investigation we propose to study and develop the I-function of two variables analogous to the I-function of one variable introduced and studied by one of the authors[24]. The conditions for convergence, series…

Complex Variables · Mathematics 2013-01-01 Shantha Kumari. K. , Vasudevan Nambisan T. M. , Arjun K. Rathie

We investigate uniqueness problems for an entire function that shares two small functions of finite order with their difference operators. In particular, we give a generalization of a result in $[2]$.

Complex Variables · Mathematics 2015-05-11 Zinelâabidine Latreuch , Abdallah El Farissi , Benharrat Belaidi

Equivalencies of many basic elementary inequalities are given

Classical Analysis and ODEs · Mathematics 2008-09-04 P. S. Bullen

An elementary proof of an identity by Lyons, Paule and Riese is given. It is simpler than all the 3 published proofs.

Combinatorics · Mathematics 2008-05-22 Helmut Prodinger

A new generalization of the classical separate algebraicity theorem is suggested and proved.

alg-geom · Mathematics 2008-02-03 R. A. Sharipov , E. N. Tzyganov

The integral representation of the Hadamard product of two functions is used to prove several Euler-type series transformation formulas. As applications we obtain three binomial identities involving harmonic numbers and an identity for the…

Number Theory · Mathematics 2016-10-10 Khristo N. Boyadzhiev

We offer new proofs, refinements as well as new results related to classical means of two variables, including the identric and logarithmic means.

Classical Analysis and ODEs · Mathematics 2015-03-23 József Sándor , Barkat Ali Bhayo

We define two finite q-analogs of certain multiple harmonic series with an arbitrary number of free parameters, and prove identities for these q-analogs, expressing them in terms of multiply nested sums involving the Gaussian binomial…

Combinatorics · Mathematics 2007-06-13 David M. Bradley

Recently, Nath and Das investigated congruence properties for the second order mock theta function $B(q)$. In their paper, they asked for analytic proofs of three identities on the second order mock theta functions $A(q)$, $B(q)$ and…

Number Theory · Mathematics 2026-01-06 Xingyuan Cai , Eric H. Liu , Olivia X. M. Yao

We establish two identities for Lambert series and double Lambert series, thereby resolving conjectures of Andrews, Dixit, Schultz and Yee (Acta Arith.~181:253--286, 2017), as well as Amdeberhan, Andrews and Ballantine (J Combin Theory…

Number Theory · Mathematics 2026-04-13 Su-Ping Cui , Dazhao Tang

This article presents a pedagogical probabilistic exploration of the Newton-Girard identities. We show that the coefficients in these classical relations between power sums and elementary symmetric polynomials can be interpreted as the…

Probability · Mathematics 2026-02-20 Jean-Christophe Pain

We present a generalization of the Newton-Girard identities, along with some applications. As an addendum, we collect many evaluations of symmetric polynomials to which these identities apply.

Number Theory · Mathematics 2019-01-25 Tanay Wakhare

Applying the theory of elliptic functions we establish two Jacobi theta function identities. From these identities we confirm two q-trigonometric identities conjectured by Gosper. As an application, we give a new and simple proof of a…

Classical Analysis and ODEs · Mathematics 2021-05-10 Bing He

We prove several infinite families of $q$-series identities for false theta functions and related series. These identities are motivated by considerations of characters of modules of vertex operator superalgebras and of quantum…

Number Theory · Mathematics 2020-09-10 Chris Jennings-Shaffer , Antun Milas